The frameshift hypothesis is a widely accepted model of bird wing evolution. This hypothesis postulates a shift in positional values, or molecular-developmental identity, that caused a change in digit phenotype. The hypothesis synthesized developmental and paleontological data on wing digit homology. The “most anterior digit” (MAD) hypothesis presents an alternative view based on changes in transcriptional regulation in the limb. The molecular evidence for both hypotheses is that the MAD expresses Hoxd13 but not Hoxd11 and Hoxd12. This digit I “signature” is thought to characterize all amniotes. Here, we studied Hoxd expression patterns in a phylogenetic sample of 18 amniotes. Instead of a conserved molecular signature in digit I, we ...
<div><p>From early dinosaurs with as many as nine wrist bones, modern birds evolved to develop only ...
In an influential model of pattern formation, a gradient of Sonic hedgehog (Shh) signalling in the c...
<div><p>An often overlooked aspect of digit development is the special nature of the terminal phalan...
The frameshift hypothesis is a widely accepted model of bird wing evolution. This hypothesis postula...
The frameshift hypothesis is a widely-accepted model of bird wing evolution. This hypothesis postula...
Vargas and Fallon (2005) propose that Hox gene expression patterns indicate that the most anterior d...
Artículo de publicación ISIBackground: The homology of the digits in the bird wing is a high-profile...
It is widely accepted that birds are a subgroup of dinosaurs, but there is an apparent conflict: mod...
International audienceEvolution involves interplay between natural selection and developmental const...
<p>The forelimb and hind limbs of representative taxa illustrate the history of digit morphology in ...
SUMMARY A highly conserved spatio-temporal pattern of cartilage formation reveals that the digits of...
<p>A) Embryology: In pentadactyl amniotes like mammals and crocodilians, the primary axis of cartila...
Background: Comparative morphology identifies the digits of the wing of birds as 1,2 and 3, but they...
An often overlooked aspect of digit development is the special nature of the terminal phalanx, a spe...
_Limusaurus_ is a remarkable herbivorous ceratosaur unique among theropods in having digits II, III ...
<div><p>From early dinosaurs with as many as nine wrist bones, modern birds evolved to develop only ...
In an influential model of pattern formation, a gradient of Sonic hedgehog (Shh) signalling in the c...
<div><p>An often overlooked aspect of digit development is the special nature of the terminal phalan...
The frameshift hypothesis is a widely accepted model of bird wing evolution. This hypothesis postula...
The frameshift hypothesis is a widely-accepted model of bird wing evolution. This hypothesis postula...
Vargas and Fallon (2005) propose that Hox gene expression patterns indicate that the most anterior d...
Artículo de publicación ISIBackground: The homology of the digits in the bird wing is a high-profile...
It is widely accepted that birds are a subgroup of dinosaurs, but there is an apparent conflict: mod...
International audienceEvolution involves interplay between natural selection and developmental const...
<p>The forelimb and hind limbs of representative taxa illustrate the history of digit morphology in ...
SUMMARY A highly conserved spatio-temporal pattern of cartilage formation reveals that the digits of...
<p>A) Embryology: In pentadactyl amniotes like mammals and crocodilians, the primary axis of cartila...
Background: Comparative morphology identifies the digits of the wing of birds as 1,2 and 3, but they...
An often overlooked aspect of digit development is the special nature of the terminal phalanx, a spe...
_Limusaurus_ is a remarkable herbivorous ceratosaur unique among theropods in having digits II, III ...
<div><p>From early dinosaurs with as many as nine wrist bones, modern birds evolved to develop only ...
In an influential model of pattern formation, a gradient of Sonic hedgehog (Shh) signalling in the c...
<div><p>An often overlooked aspect of digit development is the special nature of the terminal phalan...